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Method for effectively removing nitrate in underground water by using Zn/Cu/Ti multi-metal nanoelectrode

A nano-electrode and nitrate technology, applied in water/sludge/sewage treatment, sterilization/microdynamic water/sewage treatment, polluted groundwater/leachate treatment, etc., can solve the problem of multi-metal nano-electrode removal of nitric acid in water Salt has not been reported and other problems, to achieve the effect of low cost, convenient operation and simple production

Active Publication Date: 2016-08-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There have been many studies on the manufacture of nano-electrodes, but in the process of making nano-electrodes, no research on using Ti as a substrate to make Zn / Cu / Ti multi-metal nano-electrodes has been found. Regarding the removal of multi-metal nano-electrodes made by this method The research on nitrate in water has not been reported yet

Method used

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  • Method for effectively removing nitrate in underground water by using Zn/Cu/Ti multi-metal nanoelectrode
  • Method for effectively removing nitrate in underground water by using Zn/Cu/Ti multi-metal nanoelectrode
  • Method for effectively removing nitrate in underground water by using Zn/Cu/Ti multi-metal nanoelectrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Such as figure 1 As shown, the electrolytic cell is a cylindrical water tank made of polyethylene material, a DC voltage stabilizer is used as the power supply, the effective voltage is 0-100V, and the effective current is 0-10A.

[0057] In the experiment, the nitrate-contaminated water (NO 3 - -N, 50mg / L; Na 2 SO 4 , 0.5g / L) 100mL into the electrolytic cell, turn on the power, adjust the current, so that the current is 0.75A for electrolysis of nitrate-contaminated water. The size of the cathode and anode plates are both 10×2.5cm, and the effective area of ​​the plates is 20.0cm 2 , the anodes all use Pt electrodes, ① the cathode used is Ti cathode, and the concentration of nitrate nitrogen drops from 50.0mg / L to 42.0mg / L after 90 minutes of reaction; ② the cathode uses Ti nano-electrodes made of graphite electrodes as auxiliary electrodes (Ti-1), then the concentration of nitrate nitrogen drops from 50.0mg / L to 29.3mg / L after 90 minutes of reaction, and the remo...

Embodiment 2

[0059] The electrolyzer used in the experiment and the method of using Zn / Cu / Ti multi-metal nano-electrode to remove nitrate are as example 1, the difference is that when making Zn / Cu / Ti multi-metal nano-electrode, the copper plating time is 5 seconds, and when copper plating The current used is 0.15A, the galvanizing time is 30 seconds, and the current used during galvanizing is 0.15A. The concentration of nitrate nitrogen drops from 50.0mg / L to 18.6mg / L after 90 minutes of reaction using the multi-metal nanoelectrode. The removal rate increased by 392% compared with the use of Ti electrodes, and by 21.2% compared with the use of Cu / Ti double-layer nano-electrodes, which greatly improved the removal efficiency of nitrate. The results are as follows image 3 shown.

Embodiment 3

[0061] The electrolytic cell used in the experiment and the method of using Zn / Cu / Ti multi-metal nano-electrode to remove nitrate are as in Example 1, the difference is that when making Zn / Cu / Ti multi-metal nano-electrode, first galvanize, and the galvanizing time is 10 seconds , the current used is 0.3A, after copper plating, the copper plating time is 10 seconds, the current used is 0.15A, and the concentration of nitrate nitrogen drops from 50.0mg / L to 24.8mg / L after 90 minutes of reaction using the multi-metal nanoelectrode L, the removal rate is 315% higher than that of using Ti electrode, and 13.2% higher than that of using Cu / Ti double-layer nanoelectrode, which greatly improves the removal efficiency of nitrate. The results are as follows Figure 4 shown.

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Abstract

The invention discloses a method for effectively removing nitrate in underground water by using a Zn / Cu / Ti multi-metal nanoelectrode. The method comprises the following steps: 1, taking nitrate polluted water of which the nitrate nitrogen content is 5-200mg / L and the sodium sulfate content is 0.01-1.0g / L; 2, manufacturing a Ti nanoelectrode by taking a graphite plate as a cathode and a Ti polar plate as an anode, manufacturing a Cu / Ti double-layer nanoelectrode by taking a Cu polar plate as an anode and a Ti nanoelectrode as a cathode, and manufacturing a Zn / Cu / Ti multi-metal nanoelectrode by taking a Zn polar plate as an anode and the Cu / Ti double-layer nanoelectrode as a cathode; 3, by taking a Pt polar plate as an anode and the Zn / Cu / Ti multi-metal nanoelectrode as a cathode, putting the nitrate polluted water, the cathode plate and the anode plate into an electrolytic bath for electrolysis, thereby removing nitrate in a reduction manner, wherein the nitrate is reduced to generate nitrogen or ammonia after acquiring electrons at the cathode, and thus the purpose of removing the nitrate can be achieved. According to the method, as the Zn / Cu / Ti multi-metal nanoelectrode which is manufactured by taking the Ti nanoelectrode as a substrate is taken as the cathode, the nitrate can be effectively removed in an electrochemical reactor, and no other assistant treatment device is needed.

Description

technical field [0001] The invention belongs to the technical field of nitrate treatment in water, and in particular relates to a method for efficiently removing nitrate in groundwater by a Zn / Cu / Ti multi-metal nano-electrode. Background technique [0002] The shortage of water resources in our country seriously restricts the development of economy and society. The water body is polluted by different substances to varying degrees, which exacerbates the contradiction of water shortage. In recent years, the pollution of water bodies by nitrates has become an increasingly serious worldwide problem. Nitrate nitrogen (NO 3- -N) is the final product of the oxidative decomposition of nitrogen-containing organic matter. Nitrate nitrogen (NO 3- -N) and ammonia nitrogen (NH 3- -N), nitrite nitrogen (NO 2- -N) are collectively referred to as trinitrogen. For example, only the nitrate content in the water body increases, ammonia nitrogen (NH 3- -N), nitrite nitrogen (NO 2- -N) ...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/467
CPCC02F1/46104C02F1/46109C02F1/4676C02F2001/46133C02F2101/163C02F2103/06C02F2201/46105
Inventor 李淼刘芳刘翔
Owner TSINGHUA UNIV
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